Happy to hear your issue has been resolved, Sam. And thank you very much for the responses and information!

And just a happy update of my own ....

Though I did not do anything to try to rectify the Serial Number issue, Poser 11 is no longer presenting me the Registration notification upon opening. Phew! I don't know how that all worked out, but it is definitely a happy development right now.

Also, I went about manually re-installing all my libraries and now have them all installed. I did it this way because I wanted to make sure my library remained organized as best suits my projects.

And, most happily, my "biggest" Poser project ever, which is a set I constructed myself which includes HUNDREDS of go-to poses for Vicky, is opening and rendering with no problem.

Thank you very much, everyone, for your assistance and input!!!